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Problem: I try to delete a document from the database using document.remove() in the following codes, but it does not remove this document from database. I am confident remove() is called because the pre hook I set up for 'remove' is called.

I am having a problem with express and react communicating correctly in production. I am using Discord Oauth to log users in and in development it works fine, the user makes a request to the /auth/login route on the client side (port 3000) and it redirects them to the auth/login route in my express server (port 5000). I knew from the beggining that this would be limited to development but i have a few other routes that work in production and i cant seem to get my passport /auth/redirect route to work.

Route:/auth/login

this route just renders the prebuilt Discord Oauth URL which can be configured here in your apps Oauth2 page.

I know that all of my code is correct becuase i have tested extensively in development, production just seems to be the issue, note it is a create react app, so i basically just need to know how to make the GET /auth/redirect route working in production, i am correctly serving my react app through express with the following code:

I am using phonegap-plugin-push on Cordova and some app users get push notifications every ~30 seconds. The problem is when their device is OFFLINE and they go online say 1 hour later, they are suddenly flooded with 120 push messages at once, crashing and freezing the app.

I have a webapp using Faye for push notifications. I've packaged that web app inside a cordova android app and runs fine, and I'm using Faye.js client to listen for notifications.

The problem is that, when the application is not running in the background, notificatons are not being listened.

I've used intents in the past (a very long time ago) for an Android native app to listen for notifications but I don't know which is the "Cordova" way to do this. I would also like this to be compatible with iOS.

I have been trying to login with firebase for a few days but I get this error message I added the google-services.json file and it was successful on my first run then I got this error and I would be very happy if you can help. (google sing in method)
I looked at some solution methods, but none of them have been successful.

Duplicate class com.google.firebase.analytics.connector.internal.zzb found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Duplicate class com.google.firebase.analytics.connector.internal.zzc found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Duplicate class com.google.firebase.analytics.connector.internal.zzd found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Duplicate class com.google.firebase.analytics.connector.internal.zze found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Duplicate class com.google.firebase.analytics.connector.internal.zzf found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Duplicate class com.google.firebase.analytics.connector.internal.zzg found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Duplicate class com.google.firebase.analytics.connector.zza found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Duplicate class com.google.firebase.analytics.connector.zzb found in modules classes.jar (com.google.android.gms:play-services-measurement-api:17.2.2) and classes.jar (com.google.firebase:firebase-measurement-connector-impl:17.0.2)
Go to the documentation to learn how to <a href="d.android.com/r/tools/classpath-sync-errors">Fix dependency resolution errors</a>.
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BU�LD FAILED in 3s
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Exited (sigterm)

Standard MERN stack.
I am familiar with how Java SpringBoot application works behind a Tomcat server. For example: Each request to tomcat is a new thread for SpringBoot application.

Questions:

How does this concept (Tomcat with SpringBoot) works with ReactJS App? What webserver does
ReactJS app need? How does ReactJS handles multiple web request from different users + same user?

I have a scenario/usecase for my web application (built with
ReactJS) where I need to process order. So I am publishing (to a
queue) upon cart submission and display a "loading ticker". The
"backend" microservice will "process" the order and "publish" the result (success or fail)
to a queue. I want "listen/subscribe" to this queue in my ReactJS
website in the same session and once information received in the queue, I will remove the
"loading ticker" on the shopping cart page and update the user with orderid/invoice. Can this be done
using reactjs? How does a distributed order management process
integrate with RactJS web app?

I have just installed npm and ionic following the instructions on ionic framework website and as soon as i start a new project i get these errors.
I have tried many online solutions but none seem to work.

npm WARN deprecated tslint@6.1.2: TSLint has been deprecated in favor
of ESLint. Please see https://github.com/palantir/tslint/issues/4534 for more information.
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm WARN deprecated fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm ERR! Unexpected end of JSON input while parsing near '...a512-0baf1FhCp16LhN+x'
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Michel\AppData\Roaming\npm-cache\_logs\2020-06-07T00_38_37_180Z-debug.log